Guardian of the Ages

Artifact Creature - Golem

Defender
When a creature attacks you or a planeswalker you control, if Guardian of the Ages has defender, it loses defender and gains trample.

"At my feet, invasions end."
—Statue inscription

7/7

2013-07-01 Once Guardian of the Ages has lost defender, its triggered ability will no longer trigger when a creature attacks you or a planeswalker you control (unless it has somehow gained defender again).
2013-07-01 The effect of Guardian of the Ages's triggered ability doesn't wear off as the turn ends. Losing defender and gaining trample last indefinitely.

Card is in preconstructed decks:

mtg.wtf